In Januari 2016 I visited the Opening Ceremony of this spectacular festival in Harbin, northeast China, for two days. The temperature was -28 degrees Celsius!
I found this interesting documentary by Dominic Swire, who investigated the role of immigrant workers. It gives a quite complete view on the construction process, and the large amount of work involved in this spectacular, and economically important, event.
Because it was the opening ceremony, the evening ended with one of the most spectacular fireworks I have ever seen. For over half an hour, truly wonderful!!